// import libraries

public class Ball
{
	// declare any useful constants
	// declare instance variables (position, velocity, graphics "home", etc.)
	
	public Ball(Graphics g, ...)
	{
		// fill in slots using parameters (WATCH FOR NAME CONFLICTS!)
	}

	public void draw()
	{
		// set current color and fill the oval (both relative to graphics)	
	}
	
	public void move()
	{
		// add forces to velocities
		// add velocities to positions
		
		// check for special conditions (bounce, etc.) using position
		// and update as necessary (e.g., by "reflecting" velocity)
	}

} // class Ball